Just how much of your Web behavior is actually tracked by data aggregators? Well, Google and its affiliates alone track visitor identities on nearly two-thirds (64.4%) of worldwide Web browsing, according to a study by anti-tracking vendor Ghostery. Facebook trailed with trackers for a mere 28.8% of all page visits. Ghostery found 77.4% of pages had at least one tracker while more than 15% of pages had ten or more.

Here’s an alliance between data vendors. Time Inc.-owned Viant, which has an advertising audience database of 1.2 billion registered users, is adding information from retail data aggregator IRI. Marketers will get a clearer picture of advertising results at fine levels of detail, although not tied to identified individuals.

Bombora has launched Visitor Insights, a consent-based website tag that tracks the topics a device has consumed.   It infers intent, job function, management level, and other information that B2B publishers can use for ad targeting and personalization.  This Bombora report shows intent trends by industry: for example, media and advertising users show 70% more interest in Customer Data Platforms than they did last year.